Which of the following mechanisms will BEST prevent a Cross-Site Request Forgery (CSRF) attack?

The best mechanism to prevent a Cross-Site Request Forgery (CSRF) attack is to use synchronized session tokens. A CSRF attack is a type of web application vulnerability that exploits the trust that a site has in a user’s browser. A CSRF attack occurs when a malicious site, email, or link tricks a user’s browser into sending a forged request to a vulnerable site, where the user is already authenticated. The vulnerable site cannot distinguish between the legitimate and the forged requests, and may perform an unwanted action on behalf of the user, such as changing a password, transferring funds, or deleting data. Synchronized session tokens are a technique to prevent CSRF attacks by adding a random and unique value to each request that is generated by the server and verified by the server before processing the request. The token is usually stored in a hidden form field or a custom HTTP header, and is tied to the user’s session. The token ensures that the request originates from the same site that issued it, and not from a malicious site. Synchronized session tokens are also known as CSRF tokens, anti-CSRF tokens, or state tokens. Parameterized database queries, whitelist input values, and use strong ciphers are not mechanisms to prevent CSRF attacks, although they may be useful for other types of web application vulnerabilities. Parameterized database queries are a technique to prevent SQL injection attacks by using placeholders or parameters for user input, instead of concatenating or embedding user input directly into the SQL query. Parameterized database queries ensure that the user input is treated as data and not as part of the SQL command. Whitelist input values are a technique to prevent input validation attacks by allowing only a predefined set of values or characters for user input, instead of rejecting or filtering out unwanted or malicious values or characters. Whitelist input values ensure that the user input conforms to the expected format and type. Use strong ciphers are a technique to prevent encryption attacks by using cryptographic algorithms and keys that are resistant to brute force, cryptanalysis, or other attacks. Use strong ciphers ensure that the encrypted data is confidential, authentic, and integral.